1. (2019·江苏) 听材料，回答小题。

1. （1） What did the scientists do to the road?

   A . They repaired it. B . They painted it. C . They blocked it
3. （2） Why are young birds drawn to the road surface?

   A . It's warm. B . It's brown. C . It's smooth.
5. （3） What is the purpose of the scientists' experiment?

   A . To keep the birds there for a whole year. B . To help students study the birds well. C . To prevent the birds from being killed.